Buggy code:
default : operatorExpression = new BinaryExpression ( this . expressionStack [ ( ( expressionPtr ) - 1 ) ] , expression , info ) ; break ; } if ( operatorExpression != null ) { assistNodeParent = operatorExpression ; } } break nextElement ; case CompletionParser . K_ARRAY_INITIALIZER : ArrayInitializer arrayInitializer = new ArrayInitializer ( ) ; arrayInitializer . expressions = new Expression [ ] { expression } ; expressionPtr -= expressionLengthStack [ ( ( expressionLengthPtr ) -- ) ] ; if ( ( ( ( ( expressionLengthPtr ) > ( - 1 ) ) && ( ( expressionPtr ) > ( - 1 ) ) ) && ( ( this . expressionStack [ expressionPtr ] ) != null ) ) && ( ( this . expressionStack [ expressionPtr ] . sourceStart ) > info ) ) { ( expressionLengthPtr ) -- ; } lastCheckPoint = scanner . currentPosition ; if ( ( topKnownElementKind ( CompletionParser . COMPLETION_OR_ASSIST_PARSER , 1 ) ) == ( CompletionParser . K_ARRAY_CREATION ) ) { ArrayAllocationExpression allocationExpression = new ArrayAllocationExpression ( ) ; allocationExpression . type = getTypeReference ( 0 ) ; int length = expressionLengthStack [ expressionLengthPtr ] ; allocationExpression . dimensions = new Expression [ length ] ; allocationExpression . initializer = arrayInitializer ; assistNodeParent = allocationExpression ; } else if ( ( currentElement ) instanceof RecoveredField ) { RecoveredField recoveredField = ( ( RecoveredField ) ( currentElement ) ) ; if ( ( recoveredField . fieldDeclaration . type . dimensions ( ) ) == 0 ) { Block block = new Block ( 0 ) ; block . sourceStart = info ; currentElement = currentElement . add ( block , 1 ) ; } else { statement = arrayInitializer ; } } else if ( ( currentElement ) instanceof RecoveredLocalVariable ) { RecoveredLocalVariable recoveredLocalVariable = ( ( RecoveredLocalVariable ) ( currentElement ) ) ; if ( ( recoveredLocalVariable . localDeclaration . type . dimensions ( ) ) == 0 ) { Block block = new Block ( 0 ) ; block . sourceStart = info ; currentElement = currentElement . add ( block , 1 ) ; } else { statement = arrayInitializer ; } } else { statement = arrayInitializer ; } break nextElement ; case CompletionParser . K_ARRAY_CREATION : ArrayAllocationExpression allocationExpression = new ArrayAllocationExpression ( ) ; allocationExpression . type = getTypeReference ( 0 ) ; allocationExpression . dimensions = new Expression [ ] { expression } ; assistNodeParent = allocationExpression ; break nextElement ; case CompletionParser . K_ASSISGNMENT_OPERATOR : if ( ( ( expressionPtr ) > 0 ) && ( ( expressionStack [ ( ( expressionPtr ) - 1 ) ] ) != null ) ) { Assignment assignment ; if ( info == ( OperatorIds . EQUAL ) ) { assignment = new Assignment ( expressionStack [ ( ( expressionPtr ) - 1 ) ] , expression , expression . sourceEnd ) ; } else { assignment = new CompoundAssignment ( expressionStack [ ( ( expressionPtr ) - 1 ) ] , expression , info , expression . sourceEnd ) ; } assistNodeParent = assignment ; } break nextElement ; case CompletionParser . K_CONDITIONAL_OPERATOR : if ( info == ( CompletionParser . QUESTION ) ) { if ( ( expressionPtr ) > 0 ) { ( expressionPtr ) -- ; ( expressionLengthPtr ) -- ; expressionStack [ expressionPtr ] = expressionStack [ ( ( expressionPtr ) + 1 ) ] ; popElement ( CompletionParser . K_CONDITIONAL_OPERATOR ) ; buildMoreCompletionContext ( expression ) ; return ; } } else { if ( ( expressionPtr ) > 1 ) { expressionPtr = ( expressionPtr ) - 2 ; expressionLengthPtr = ( expressionLengthPtr ) - 2 ; expressionStack [ expressionPtr ] = expressionStack [ ( ( expressionPtr ) + 2 ) ] ; popElement ( CompletionParser . K_CONDITIONAL_OPERATOR ) ; buildMoreCompletionContext ( expression ) ; return ; } } break nextElement ; case CompletionParser . K_BETWEEN_LEFT_AND_RIGHT_BRACKET : ArrayReference arrayReference ; <START_BUG> if ( ( ( expressionPtr ) > 0 ) && ( ( expressionStack [ expressionPtr ] ) == expression ) ) { <END_BUG> arrayReference = new ArrayReference ( expressionStack [ ( ( expressionPtr ) - 1 ) ] , expression ) ; } else { arrayReference = new ArrayReference ( getUnspecifiedReferenceOptimized ( ) , expression ) ; } assistNodeParent = arrayReference ; break ; } } if ( ( assistNodeParent ) != null ) { currentElement = currentElement . add ( ( ( Statement ) ( assistNodeParent ) ) , 0 ) ; } else { if ( ( ( currentElement ) instanceof RecoveredField ) && ( ( ( ( RecoveredField ) ( currentElement ) ) . fieldDeclaration . initialization ) == null ) ) { assistNodeParent = ( ( RecoveredField ) ( currentElement ) ) . fieldDeclaration ; currentElement = currentElement . add ( statement , 0 ) ; } else if ( ( ( currentElement ) instanceof RecoveredLocalVariable ) && ( ( ( ( RecoveredLocalVariable ) ( currentElement ) ) . localDeclaration . initialization ) == null ) ) { assistNodeParent = ( ( RecoveredLocalVariable ) ( currentElement ) ) . localDeclaration ; currentElement = currentElement . add ( statement , 0 ) ; } else { currentElement = currentElement . add ( expression , 0 ) ; } } } public int bodyEnd ( AbstractMethodDeclaration method ) { } public int bodyEnd ( Initializer initializer ) { } private boolean checkCatchClause ( ) { } private boolean checkClassInstanceCreation ( ) { } private boolean checkClassLiteralAccess ( ) { } private boolean checkKeyword ( ) { } private boolean checkInstanceofKeyword ( ) { } private boolean checkInvocation ( ) { } private boolean checkMemberAccess ( ) { } private boolean checkNameCompletion ( ) { } private boolean checkRecoveredMethod ( ) { } private boolean checkRecoveredType ( ) { } public void completionIdentifierCheck ( ) { } protected void consumeArrayCreationExpressionWithInitializer ( ) { } protected void consumeArrayCreationExpressionWithoutInitializer ( ) { } protected void consumeAssignment ( ) { }

Fix:
if ( ( ( ( identifierPtr ) < 0 ) && ( ( expressionPtr ) > 0 ) ) && ( ( expressionStack [ expressionPtr ] ) == expression ) ) {